CN101706188A - Liquid helium external flow path system design used for high pumping speed deep cooling system - Google Patents
Liquid helium external flow path system design used for high pumping speed deep cooling system Download PDFInfo
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- CN101706188A CN101706188A CN200910092072A CN200910092072A CN101706188A CN 101706188 A CN101706188 A CN 101706188A CN 200910092072 A CN200910092072 A CN 200910092072A CN 200910092072 A CN200910092072 A CN 200910092072A CN 101706188 A CN101706188 A CN 101706188A
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Abstract
The invention discloses a liquid helium external flow path system design used for a high pumping speed deep cooling system, which comprises a low temperature fluid supply system and a low temperature fluid discharging system, wherein the low temperature fluid supply system is communicated with a vacuum container through a liquid nitrogen inlet and a liquid helium inlet; and the low temperature fluid discharging system is communicated with the vacuum container through a liquid nitrogen outlet and a liquid helium outlet. Before a liquid helium system works, cheap liquid nitrogen is utilized for precooling so as to avoid the waste of expensive liquid helium. The liquid helium external flow path system design also has the advantages of simple equipment, convenient use and transportation, low renting price, high safety, good sealing property, wide application range and the like.
Description
[technical field]
The present invention relates to be used to simulate the design of the outer flow process system of the necessary low temperature of vacuum cryogenic environment.The present invention is used in particular for simulating the design of the necessary liquid helium external flow path of big pumping speed ultrahigh vacuum cryogenic environment system.
[background technology]
Can successfully launch in order to guarantee various spacecrafts, operation reaches and finishes various preset task satisfactorily and successfully return ground reliably, must set up ground level heat vacuum environment simulated test facility, the outer flow process induction system of cryogenic liquid then is the important component part of ground vacuum environment simulated test facility.
At present, hot vacuum environment simulated test facility both domestic and external mostly adopts the outer flow process of liquid nitrogen to freeze, in order to the cold darkness environment of simulation space, but for the system that requires final relief amount, big pumping speed, the vacuum that can simulate is not high, can only simulate the following environmental pressure of 100km.Along with the swift and violent development of China Aerospace, the needs of final relief loading gage people space flight, the demand of rocket engine plume test, adopt the outer flow process of liquid nitrogen to freeze and can't reach requirement, this just requires to adopt liquid helium external flow path to freeze, it can simulate the above environmental pressure of 100km, more approaches real vacuum cryogenic environment.The liquid helium system can make the inner static vacuum of vacuum tank reach 10
-6～10
-7Pa, the static vacuum that can reach than existing liquid nitrogen system exceeds 1～2 order of magnitude.
For the high pumping speed deep cooling system that the final relief amount is arranged, the liquid helium consumption is very big, as the large-scale plume testing system of Beijing Institute of Aeronautics development, and its liquid helium is heat sink area 200m
2, for alleviating the influence of expanding with heat and contract with cold, with liquid helium heat sink along the cabin axon to being divided into 4 sections, the liquid helium amount that each test consumes is 5～6m
3, test period 5～6 hours.According to market survey, the liquid helium scarcity of resources needs to be sub-divided in after the import in the liquid helium jar of 500L from U.S.'s import, and the liquid helium jar One's name is legion of domestic 500L, and transportation is also convenient, and liquid helium jar rent is not high, need not oneself buy liquid helium jar, cost saving.According to the market survey result, consider convenient transportation, designed the liquid helium external flow path system at 500L liquid helium jar.
[summary of the invention]
The purpose of this invention is to provide a kind of simple, reliable, practical being used to and simulate the liquid helium external flow path system design of ultrahigh vacuum cryogenic environment.The problem to be solved in the present invention is that system adopts open method that the liquid helium refrigeration is provided; Every road liquid helium heat sink pipeline liquid helium flow is all adjustable; System equipment is simple; One-time investment is little; Can replenish liquid helium in the process of the test easily or switch the liquid helium jar and do not influence test and carry out; During liquid helium system long-time operate as normal, except that additional liquid helium or switch the liquid helium jar, can move automatically, need not manual adjustment; The liquid helium system is provided with safety valve in liquid helium heat sink pipeline exit, and venting is used when supplying loine pressure too high.
The liquid helium external flow path system design that is used for the high pumping speed deep cooling system shown in Figure 1, comprise heat sink (1,2,3,4,5,6,7,9), snap joint (8), liquid level gauge (11), thermometer (10), 500L liquid helium jar (12), helium tank (13), flowmeter (14), low temperature liquid nitrogen valve (V1), low temperature liquid nitrogen valve (V2), low-temperature liquid helium control valve (V3), normal temperature gas helium hand valve (V4), low-temperature liquid helium control valve (V5), normal temperature gas helium hand valve (V6), low-temperature liquid helium control valve (V7), normal temperature gas helium hand valve (V8), low-temperature liquid helium control valve (V9), normal temperature gas helium hand valve (V10), normal temperature gas helium pressure-reducing valve (V11), liquid helium pipeline safety valve (V12), total atmospheric valve (V13), liquid helium pipeline safety valve (V14), the vacuum dewar pipeline. connect liquid helium external flow path system and vacuum environment simulated test cabin, ground with snap joint, so that the liquid helium pipeline communicates with heat sink pipeline in the cabin. liquid helium flows to from body bottom, cabin, flow out on top.
Snap joint connected mode shown in Figure 2 is a bell and spigot frame, comprises loose flange (1), sealing ring (2), mounting flange (3), damping cover (4), vacuum layer (5), heat sink pipeline (6), Dewar intubate (7).
Advantage and good effect that a kind of simple liquid helium external flow path system supply method that is used for cryogenic system of the present invention has are: (1) has adopted open method that the liquid helium refrigeration is provided, and cost is low, and equipment is simple, and is easy to use; (2) adopt 500L liquid helium jar feed flow, convenient transportation is rented cheap; (3) liquid helium heat sink pipeline exit is provided with safety valve, can the assurance system safety of operation; (4) before the liquid helium system works, utilize cheap liquid nitrogen precooling earlier, avoided the waste of expensive liquid helium; (5) adopt snap joint to switch liquid nitrogen supply line and liquid helium supply line, make liquid nitrogen and liquid helium realize physical isolation, avoid the appearance of the cold leakage phenomenon of liquid helium in the handoff procedure; (6) can replenish liquid helium or switch the liquid helium jar and do not influence test and carry out in the process of the test easily; (7) liquid nitrogen, liquid helium discharge pipe are public, and valve part quantity is reduced, and save cost; (8) every road liquid helium heat sink pipeline liquid helium flow all can be regulated, and guarantees the uniformity of heat sink cooling, can effectively reduce the liquid helium consumption; (9) on the pipeline of the heat sink exit of liquid helium thermometer is installed, in order to monitor the temperature of heat sink exit, every road fluid; (10) this method has range of application comparatively widely, highly versatile.Can be applied to the various supplies that are used for the outer flow process system of cryogenic liquid of cryogenic system.
[description of drawings]
Fig. 1 is an open type liquid helium external flow path systematic schematic diagram
Fig. 2 is snap joint (bell and spigot frame)
[specific implementation method]
Further specify the present invention below in conjunction with accompanying drawing with embodiment.
Implementing this liquid helium external flow path system supply method equipment therefor mainly comprises: comprise heat sink (1,2,3,4,5,6,7,9), snap joint (8), liquid level gauge (11), thermometer (10), 500L liquid helium jar (12), helium tank (13), flowmeter (14), low temperature liquid nitrogen valve (V1), low temperature liquid nitrogen valve (V2), low-temperature liquid helium control valve (V3), normal temperature gas helium hand valve (V4), low-temperature liquid helium control valve (V5), normal temperature gas helium hand valve (V6), low-temperature liquid helium control valve (V7), normal temperature gas helium hand valve (V8), low-temperature liquid helium control valve (V9), normal temperature gas helium hand valve (V 10), normal temperature gas helium pressure-reducing valve (V11), liquid helium pipeline safety valve (V12), total atmospheric valve (V13), liquid helium pipeline safety valve (V14), the vacuum dewar pipeline.Whether the state of each parts of pretest inspection system is good, after inspection finishes, can start the liquid helium external flow path system to liquid helium heat sink pipeline supply liquid helium according to corresponding technological process.
As shown in Figure 1, the liquid helium external flow path system is the open type feed liquid way, according to the test needs, cabin body fluid helium is heat sink to be divided into four parts, corresponding liquid helium is imported and exported also respectively four, be down and advance to go up removing from mould, liquid helium is flowed through and directly is discharged in the atmosphere after the liquid helium heat sink pipeline, because the liquid helium latent heat of vaporization is little, vaporized in a large number after the liquid helium heat sink pipeline of flowing through, for preventing the system pipeline hypertonia, safety valve (V12) respectively has been installed (V14) in liquid helium heat sink pipeline exit, be no more than the pipeline authorized pressure with control gas helium pressure.Low temperature control valve (V3), (V5), (V7), (V9) are used for regulator solution helium flow amount, regulate flow by the aperture of regulating the low temperature control valve.Helium tank is mainly used to the liquid helium jar provides boost pressure, to prevent that supply along with liquid helium from causing the liquid helium sump pressure to be crossed and lowly influencing system and normally move.Pressure-reducing valve (V11) mainly is to be used for reducing helium pressure, to reach instructions for use.Flowmeter mainly is used for monitoring helium pipeline helium gas flow, the supply pressure of accurately regulating the liquid helium jar by valve (V4), (V6), (V8), (V10) that regulates on the flowmeter pipeline, reach strict control liquid helium amount of infusion, avoid the undesired waste of liquid helium.On every pipeline in the heat sink exit of liquid helium thermometer is installed all, in order to monitoring the fluid temperature (F.T.) in every heat sink exit, judges the size of piping flow by temperature, conveniently to carry out the Flow-rate adjustment of follow-up pipeline, fluid consuming when reducing precooling.
The liquid helium costliness in order to reduce the consumption of liquid helium, reduces operating cost, can utilize in the liquid nitrogen precooling cabin liquid helium heat sink earlier, and the concrete running of liquid helium external flow path system is as follows:
1) at first opens low temperature liquid nitrogen valve (V1), low temperature liquid nitrogen valve (V2), total atmospheric valve (V13), to be used to connect heat sink and snap joint liquid nitrogen system of liquid helium inserts, carry liquid nitrogen to the liquid helium heat sink pipeline, be chilled to about 100K fully in advance from normal temperature with liquid helium is heat sink through the long period;
2) close low temperature liquid nitrogen valve (V1), low temperature liquid nitrogen valve (V2) then, will be used to connect heat sink and snap joint liquid nitrogen system of liquid helium and extract;
3) will be used to connect the heat sink and snap joint liquid helium system of liquid helium inserts, slowly open low-temperature liquid helium control valve (V3), (V5), (V7), (V9), standard-sized sheet not, while Open valve (V4), (V6), (V8), (V10), pressure-reducing valve (V11), slowly precooling infusion pipeline and liquid helium are heat sink with liquid helium, in this stage, because the heat sink temperature that is in about 100K, when liquid helium just is input to pipeline, vaporization rapidly, can only play the heat sink effect of precooling liquid helium, the sensible heat that can make full use of gas helium this moment comes cooling heat sink, to reduce the consumption of liquid helium;
4) utilize thermometer, liquid level gauge, flowmeter to monitor the running status of liquid helium external flow path system, regulate corresponding valve opening, reduce open type fluid consumption according to different running statuses;
5) when heat sink when obtaining abundant precooling and reaching the 10K left and right sides, but standard-sized sheet low-temperature liquid helium control valve (V3), (V5), (V7), (V9), at suitable pressures to pipeline input liquid helium.The gas helium that comes out from heat sink pipeline can reclaim or directly emptying;
6) environmental pressure in the monitoring cabin sees whether reach test requirements document;
7) after test is finished, close low temperature control valve (V3), (V5), (V7), (V9), stop liquid helium and supply with.
Claims (9)
1. be used to simulate outer flow process liquid (stream) body conveying system of low temperature of vacuum cryogenic environment, comprise cryogen supply system, cryogen exhaust system; The cryogen supply system is connected with vacuum tank by liquid nitrogen inlet and liquid helium inlet; The cryogen exhaust system is connected with vacuum tank by liquid nitrogen outlet and liquid helium outlet.
2. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1, it is characterized in that: the cryogen supply system comprises: snap joint, the liquid helium jar, low temperature liquid nitrogen valve (V1), low temperature liquid nitrogen valve (V2), low-temperature liquid helium control valve (V3), normal temperature gas helium hand valve (V4), low-temperature liquid helium control valve (V5), normal temperature gas helium hand valve (V6), low-temperature liquid helium control valve (V7), normal temperature gas helium hand valve (V8), low-temperature liquid helium control valve (V9), normal temperature gas helium hand valve (V10), normal temperature gas helium pressure-reducing valve (V11), the vacuum dewar pipeline, liquid level gauge, flowmeter.
3. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1 is characterized in that: adopt multichannel liquid helium jar supply multichannel liquid helium heat sink pipeline.
4. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1 is characterized in that: adopt 500L liquid helium jar feed flow.
5. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1 is characterized in that: adopt snap joint to switch liquid nitrogen supply line and liquid helium supply line.
6. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1, it is characterized in that: the cryogen exhaust system comprises: liquid helium pipeline safety valve (V12), total atmospheric valve (V13), liquid helium pipeline safety valve (V14), vacuum dewar pipeline, thermometer.
7. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1, it is characterized in that: the vacuum dewar pipeline of liquid nitrogen, liquid helium discharging is public.
8. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1, it is characterized in that: liquid helium heat sink pipeline exit is provided with low-temperature safety valve (V12), low-temperature safety valve (V14).
9. outer flow process liquid (stream) body conveying system of low temperature that is used to simulate the vacuum cryogenic environment as claimed in claim 1, it is characterized in that: liquid helium heat sink pipeline exit is provided with the low temperature control valve.
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| CN200910092072A CN101706188A (en) | 2009-09-16 | 2009-09-16 | Liquid helium external flow path system design used for high pumping speed deep cooling system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087065A (en) * | 2010-11-23 | 2011-06-08 | 北京航空航天大学 | Liquid helium external flow path system design for high pumping speed deep cooling system |
| CN102322411A (en) * | 2011-09-01 | 2012-01-18 | 南京钢铁股份有限公司 | Method and device for discharging pre-cooled liquid in cryogenic liquid pump |
| CN113405996A (en) * | 2021-06-25 | 2021-09-17 | 北京卫星环境工程研究所 | Lunar soil reflection spectrum simulation measuring device and method in deep low temperature environment |
| CN114719539A (en) * | 2022-05-12 | 2022-07-08 | 中国航空研究院 | Engine body precooling system and method applied to high-ultrasonic aircraft |
-
2009
- 2009-09-16 CN CN200910092072A patent/CN101706188A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102087065A (en) * | 2010-11-23 | 2011-06-08 | 北京航空航天大学 | Liquid helium external flow path system design for high pumping speed deep cooling system |
| CN102322411A (en) * | 2011-09-01 | 2012-01-18 | 南京钢铁股份有限公司 | Method and device for discharging pre-cooled liquid in cryogenic liquid pump |
| CN102322411B (en) * | 2011-09-01 | 2013-05-29 | 南京钢铁股份有限公司 | Method and device for discharging pre-cooled liquid in cryogenic liquid pump |
| CN113405996A (en) * | 2021-06-25 | 2021-09-17 | 北京卫星环境工程研究所 | Lunar soil reflection spectrum simulation measuring device and method in deep low temperature environment |
| CN114719539A (en) * | 2022-05-12 | 2022-07-08 | 中国航空研究院 | Engine body precooling system and method applied to high-ultrasonic aircraft |
| CN114719539B (en) * | 2022-05-12 | 2023-09-22 | 中国航空研究院 | Organism precooling system and method applied to hypersonic aircraft |
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Open date: 20100512 |